The Siemens 5SY4103-7CC11 is a 1-pole SENTRON miniature circuit breaker rated at 3 A with a C tripping characteristic, designed to protect branch circuits against overloads and short circuits in industrial and railway applications. Its 10 kA breaking capacity per EN 60898 at 400 V AC means it can safely interrupt fault currents up to that level without cascading upstream — a figure that governs selectivity coordination in distribution panels.
Physical fit and terminal capacity
18 mm wide (1 width unit), depth 76 mm (installation depth 70 mm). Terminals accept solid or stranded 0.75 to 35 mm², tightening torque 2.5 to 3.5 N·m.